Experimental Determination of Electron-Transfer Cross Sections for Fluorine Ions in Nitrogen at Energies from 4 to 54 MeV

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Abstract
Electron-capture and -loss cross sections have been measured for fluorine ions passing through nitrogen gas in the energy range from 5 to 54 MeV. Cross sections for multiple electron transfer in a single collision have been obtained in the analysis with quadruple capture and triple loss determined in some cases. The velocity dependence of the capture cross sections is discussed, and capture by the bare fluorine nucleus is in good agreement with theory. The ratio of the cross sections for double to single capture are discussed in terms of a geometry-independent component of the electron-capture process. The cross sections for electron loss are presented and a comparison is made between the velocity dependence observed and an elementary theoretical model.